Add father/mother links to NPCs, derived from the relationships text

- Npc gains self-referencing father/mother (nullable, ON DELETE SET NULL);
  editable as dropdowns on the per-NPC form
- app:npc:link-parents parses "son/daughter/child of X [and Y]" from the
  Relationships / Notes column, resolves the names within the same family,
  and works out which parent is father vs mother from husband/wife/widow(er)
  and son/daughter/sister/brother cues (plus a small name-gender table for
  the few the text can't disambiguate). --dry-run / --force. 92/180 linked,
  none ambiguous.
- migrations now pin ENGINE=InnoDB - the local WAMP MariaDB defaults to
  MyISAM, which silently drops foreign keys

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/Entity/Npc.php

@@ -43,6 +43,14 @@ class Npc
     #[ORM\Column(type: Types::TEXT, nullable: true)]
     private ?string $relationships = null;
 
+    #[ORM\ManyToOne(targetEntity: self::class)]
+    #[ORM\JoinColumn(name: 'father_id', onDelete: 'SET NULL')]
+    private ?Npc $father = null;
+
+    #[ORM\ManyToOne(targetEntity: self::class)]
+    #[ORM\JoinColumn(name: 'mother_id', onDelete: 'SET NULL')]
+    private ?Npc $mother = null;
+
     #[ORM\Column(enumType: VillageStatus::class)]
     private VillageStatus $villageStatus = VillageStatus::Established;
 
@@ -143,6 +151,30 @@ class Npc
         return $this;
     }
 
+    public function getFather(): ?Npc
+    {
+        return $this->father;
+    }
+
+    public function setFather(?Npc $father): static
+    {
+        $this->father = $father;
+
+        return $this;
+    }
+
+    public function getMother(): ?Npc
+    {
+        return $this->mother;
+    }
+
+    public function setMother(?Npc $mother): static
+    {
+        $this->mother = $mother;
+
+        return $this;
+    }
+
     public function getVillageStatus(): VillageStatus
     {
         return $this->villageStatus;